patch 8.2.0879: compiler warning for unused function argument

Problem:    Compiler warning for unused function argument.
Solution:   Add UNUSED.

src/search.c

@@ -3170,7 +3170,7 @@ update_search_stat(
     searchstat_T	*stat,
     int			recompute,
     int			maxcount,
-    long		timeout)
+    long		timeout UNUSED)
 {
     int		    save_ws = p_ws;
     int		    wraparound = FALSE;

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    879,
 /**/
     878,
 /**/